How to Calculate BAC – Blood Alcohol Content

See below how to calculate BAC, or your blood alcohol content level, before you drive. All 50 states have set the minimum BAC legal limit at 0.08% BAC for drivers over 21, 0.02% BAC for underage drivers, and 0.04% BAC for CDL drivers.

If you have been arrested for drunken driving because your blood alcohol content level was above the legal BAC limit, you need a top DUI attorney to fight the DUI breath test results. Just because the police evidence includes the results of a DUI breath test that you think are too damaging to win your case, do not plead guilty! Call a top DUI lawyer in your area right now at 844-832-6384 anytime day or night. Damaging chemical evidence can be excluded from your trial!

The BAC calculator below shows your legal BAC by weight, or your estimated blood alcohol level by the number of drinks consumed in relation to your body weight. It will show you your BAC after one beer. Here is how to estimate your blood alcohol content using our drunk calculator:

1. Count your number of drinks consumed. One drink = 1 ounce of 100-proof liquor, one 5 ounce glass of table wine, or one 12 ounce bottle of regular beer.

2. Using the chart below, find where “# of Drinks Consumed” and “Body Weight” intersect. This is your estimated BAC.

3. Subtract from this number the percent of alcohol “burned up” during the time elapsed since your first drink. This “burn up” rate is .015% per hour. (Example: 180 lb. man – 8 drinks in 4 hours / .167% minus (.015×4) = .107 %

# of Drinks Consumed

Body Weight

1

2

3

4

5

6

7

8

9

10

11

12

100 lb.

.038

.075

.113

.150

.188

.225

.263

.300

.338

.375

.413

.450

110 lb.

.034

.066

.103

.137

.172

.207

.241

.275

.309

.344

.379

.412

120 lb.

.031

.063

.094

.125

.156

.188

.219

.250

.281

.313

.344

.375

130 lb.

.029

.058

.087

.116

.145

.174

.203

.232

.261

.290

.320

.348

140 lb.

.027

.054

.080

.107

.134

.161

.188

.214

.241

.268

.295

.321

150 lb.

.025

.050

.075

.100

.125

.151

.176

.201

.226

.251

.276

.301

160 lb.

.023

.047

.070

.094

.117

.141

.164

.188

.211

.234

.258

.281

170 lb.

.022

.045

.066

.088

.110

.132

.155

.178

.200

.221

.244

.265

180 lb.

.021

.042

.063

.083

.104

.125

.146

.167

.188

.208

.229

.250

190 lb.

.020

.040

.059

.079

.099

.119

.138

.158

.179

.198

.217

.237

200 lb.

.019

.038

.056

.075

.094

.113

.131

.150

.169

.188

.206

.225

210 lb.

.018

.036

.053

.071

.090

.107

.125

.143

.161

.179

.197

.215

220 lb.

.017

.034

.051

.068

.085

.102

.119

.136

.153

.170

.188

.205

230 lb.

.016

.032

.049

.065

.081

.098

.115

.130

.147

.163

.180

.196

240 lb.

.016

.031

.047

.063

.078

.094

.109

.125

.141

.156

.172

.188

A high BAC at the time of your DUI arrest can look hopeless, but we can help! Even one beer can affect your BAC by weight. Our top-rated DUI criminal lawyers can file pre-trial motions to suppress breath test results, and we will fight your DUI charges all the way with a winnable DUI defense. A lot of drivers are stopped at DUI checkpoints and given a breathalyzer test. If you “blow” over the legal limit, which is 0.08% in all 50 states, the officer will usually ask you to perform field sobriety tests. These tests are VOLUNTARY! Nothing good can come from taking them.

If you are eventually arrested for drunken driving, the police also may order a DUI blood test before you are taken to jail. Therefore, how to calculate BAC is important if you are unsure about your ability to drive safely.

DrunkDrivingDefense.com attorneys are all in, all the time. Do not plead guilty! Talk to us first. Talk to us now.